OVERVIEW: The NMRS (Near-Term Mine Reconnaissance System) is a submarine-launched, tethered UUV deployed via standard torpedo tubes to perform covert minefield reconnaissance. It provides real-time sonar data to identify and classify mines in littoral environments ahead of naval operations.

DETAILS: NMRS comprises two fiber-optic-controlled UUVs approximately the size of an Mk 48 torpedo, equipped with side-scan and multibeam sonar for obstacle and mine detection in shallow to deep water . Developed in the mid‑1990s by Northrop Grumman and Lockheed Martin, the system conducted sea trials in 1998–1999 and entered limited operational use aboard Los Angeles-class submarines around 2002. It allowed continuous two-way data transmission via fiber-optic tether, enabling onboard analysis and mission adjustments. NMRS was intended as an interim capability pending the autonomous LMRS (AN/BLQ-11), but was retired in 2005 after prototype use.

FUNCTION: The UUV is reverse-loaded into a torpedo tube, then deployed under fiber-optic control to map and classify mine-like objects ahead of the host submarine. After mission completion or tether break, the vehicle autonomously returns to a rendezvous point for recovery via the tube winch system.

NOTE:
IOC: circa 1998 (trials), ~2002 (initial operational deployment); retired 2005
Operators: United States Navy (Los Angeles-class SSNs)
Platforms: SSN-688 Los Angeles-class submarines (via Mk 48 torpedo tubes)
Conflict used in: Not deployed in combat; used in tests and training missions

SOURCE: Naval Undersea Museum NMRS profile: https://navalunderseamuseum.org/nmrs/ ; FAS: https://fas.org/man/dod-101/sys/ship/weaps/nmrs.htm